// Array index for main sections of web site 
var idxSiteSection = 3;
// Array of the current URL, split on "/"
var arrLoc = window.location.toString().split("/");
// make a replacement for the home page top nav image name
if (arrLoc[idxSiteSection] == "" || arrLoc[idxSiteSection] == "index.shtml")
	arrLoc[idxSiteSection] = "home";

function highlightTopNavImage()
{
	var arrTopNavImages = document.getElementById("topNavTable").getElementsByTagName("img");
	for (var i=0; i<arrTopNavImages.length; i++)
		if (arrTopNavImages[i].id == arrLoc[idxSiteSection])
			arrTopNavImages[i].src = "/images/" + arrTopNavImages[i].id + "-over.gif";
}

/***
	Check to ensure that the top nav image being moused over is not the current top nav image
*/
function isCurrentTopNavImage(imageName)
{
	if (arrLoc[idxSiteSection] == imageName)
		return true;
	return false;
}

/***
	Creates a new image object.
*/
function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

/***
	Image rollover function for top nav and left navs.
*/
function changeImages(imageName, imageFile) {
	if (document.images && preloadFlag == true && !isCurrentTopNavImage(imageName))
			document[imageName].src = imageFile;
}

/***
	Preload images for rollovers.
*/
var preloadFlag = false;
var theImages = new Array();
function preloadImages()
{
	for (i=0; i < preloadImages.arguments.length; i++)
	{
		theImages[i]=new Image();
		theImages[i].src=preloadImages.arguments[i];
	}
	preloadFlag = true;
}
preloadImages(
	"/images/the-little-elephant-over.gif",
	"/images/order-books-over.gif",
	"/images/about-hippocratic-press-over.gif",
	"/images/contact-us-over.gif",
	"/images/home-over.gif",
	"/images/left_nav/description-over.gif",
	"/images/left_nav/testimonials-over.gif",
	"/images/left_nav/about-the-author-over.gif",
	
	"/images/left_nav/sadie-over.png",
	"/images/left_nav/peeper-over.png",
	"/images/left_nav/katie-over.png",
	"/images/left_nav/elephant-over.png",
	"/images/left_nav/about-the-illustrator-over.png",
	"/images/left_nav/testimonials-over.png",
	"/images/left_nav/references-over.png",
	"/images/left_nav/about-the-author-over.png",
	"/images/left_nav/upcoming-books-over.png",
	"/images/left_nav/origin-over.png",
	"/images/left_nav/dr-hippos-mission-over.png"
);